Single rectangle, 4 lite with thin mullions, set for 1 piece of glass. Glass by others and not provided by MCI

Notice the machined-mortise work on the criss/cross mullions for a tight, proper fit. These are not the typical unsecure butt joints, but machined into an interlocking manor. The result is not only a great fit, but accurate alignment as well. The smooth back joints enabling one piece glass. This saves the expense multi cutting glass labor

This is not a standard but is available in house from MCI when order noted.